Arnold & Porter

Arnold & Porter's merger control offering boasts experience supporting large, multinational clients such as AT&T, BP, Visa, Cisco and Samsung, who seek out the team for its in-depth knowledge of antitrust practice. Its expertise regarding the life sciences sector is particularly notable, paired with comprehensive antitrust experience across mergers, litigation, government investigations, and cartel matters. Debbie Feinstein and Michael B. Bernstein co-head the team from Washington DC: a former Director of the Bureau of Competition at the FTC, Feinstein focuses her practice on merger and acquisition reviews by enforcement agencies across the US and globally. Both public and private companies seek out Bernstein for their significant merger matters. Jonathan Gleklen is a go-to for clients in the high technology and network industries, and Sonia Pfaffenroth draws on longstanding experience in the Department of Justice to handle complex antitrust litigation: both are based in Washington DC. The team grew in November 2024 with the addition of William Efron, formerly of the Federal Trade Commission.